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Post employment benefits - Sensitivity analysis (Details) - Defined benefit pension plan
€ in Millions
12 Months Ended
Mar. 31, 2021
EUR (€)
Rate of inflation  
Sensitivity analysis  
Decrease in actuarial assumption (as a percent) 0.50%
Increase in actuarial assumption (as a percent) 0.50%
Decrease in actuarial assumption € (572)
Increase in actuarial assumption € 641
Rate of increase in salaries  
Sensitivity analysis  
Decrease in actuarial assumption (as a percent) 0.50%
Increase in actuarial assumption (as a percent) 0.50%
Decrease in actuarial assumption € (4)
Increase in actuarial assumption € 4
Discount rate  
Sensitivity analysis  
Decrease in actuarial assumption (as a percent) 0.50%
Increase in actuarial assumption (as a percent) 0.50%
Decrease in actuarial assumption € 854
Increase in actuarial assumption € (738)
Life expectancy  
Sensitivity analysis  
Increase in actuarial assumption life expectancy (in Years) 1 year
Decrease in actuarial assumption life expectancy (in Years) 1 year
Decrease in actuarial assumption € (278)
Increase in actuarial assumption € 275